Method for producing an industrial aqueous sodium chloride...

C - Chemistry – Metallurgy – 01 – D

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C01D 3/16 (2006.01) C01D 3/04 (2006.01)

Patent

CA 2255585

The invention discloses a method for producing an industrial aqueous sodium chloride solution comprising the following steps: in a first step, fumes containing hydrogen chloride and lead (2) is treated by a dry process with sodium bicarbonate (14) to form a solid residue (8) containing sodium chloride, sodium bicarbonate and lead, in a second step (6), this solid residue is separated from the fumes and introduced in an aqueous medium, in a third step (9), the aqueous medium is filtered (13) and an aqueous sodium chloride solution (15) is obtained, and in a fourth step (17), this aqueous solution is treated with at least one soluble lead precipitating agent (16), then the resulting precipitate is separated from it (20).

Procédé pour la fabrication d'une solution aqueuse industrielle de chlorure de sodium, selon lequel, dans une première étape, on traite une fumée contenant du chlorure d'hydrogène et du plomb (2), par voie sèche, avec du bicarbonate de sodium (14) pour former un résidu solide (8) comprenant du chlorure de sodium, du carbonate de sodium et le plomb, puis on sépare ce résidu solide de la fumée, dans une deuxième étape (6), on introduit ce résidu solide dans un milieu aqueux, dans une troisième étape (9), on filtre (13) le milieu aqueux et on recueille une solution aqueuse de chlorure de sodium (15), et, dans une quatrième étape (17), on traite cette solution aqueuse au moyen d'au moins un agent précipitant du plomb soluble (16), puis on en sépare le précipité formé (20).

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